Maro Publications

Polyamide Materials

Patents with Abstracts

*8/16/2013  
from 5/16/2012

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Patents with Abstracts

13. 8,507,598 
Transparent polyamide moulding compound 

Transparent polyamides have excellent transparency and a low haze (opacity). Most additives change these optical properties very negatively. The usability of transparent products depends substantially upon the opacity (haze) which is increased by damage to the surface. A particular type of scratch resistance is for example the resistance of an uncoated plastic material surface relative to a PE pen. This property is required for example in display applications which are operated with a PE pen.

Buhler et al of EMS-Patent AG, Switzerland, developed a transparent polyamide materials with improved scratch resistance consisting of (A1) 50 to 99.99 parts by weight of a copolyamide, (A2) 0 to 49.99 parts by weight of a transparent polyamide, (A3) 0 to 29.99 parts by weight of an aliphatic polyamide, (B) 0.01 to 5 parts by weight of a lubricant, and (C) 0 to 3 parts by weight of further additives where the sum of (A1) and (A2) and (A3) and (B) is 100 parts by weight.

Surprisingly, lubricants have been found which do not negatively influence the transparency, do not increase the haze and improve the scratch resistance of the transparent polyamides. These lubricants can be added directly to the polymer by mixing with the polymer or preferably as a highly concentrated master batch.  Outstandingly suitable for the use according to the invention are salts of stearic acid, isotridecylstearate and/or salts of montanic acids, montanic acid esters and the Ca salts thereof (Licomont and Licomont CAV types) since they display low opacity.

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12. 8,357,450 
Polyamide-polyphenylene ether resin composition and film 

Miyoshi and Furukawa of Asahi Kasei Chemicals Corporation, Japan, developed a polyamide-polyphenylene ether material consisting of a polyamide having an alicyclic structure and dicarboxylic acid units consisting of 20 to 100 mol % of cyclohexanedicarboxylic acid units and diamine units with aliphatic 6 to 12 carbon atom diamine units, a polyphenylene ether, and a compatibilizer. (RDC 1/28/2013)

11. 8,357,455 
Transparent moulding compound 

Baumann et al of Evonik Degussa GmbH, Germany, a transparent molding material consisting of 50 % by weight of a copolyamide with 65 to 99 mol % of an equimolar mixture of an unbranched 6 to 18 carbon atom aliphatic diamine and an unbranched, 6 to 18 carbon atom aliphatic dicarboxylic acid for a printable or printed item, such as a ski topcoat. (RDC 1/28/2013)

10. 8,303,873 
Use of a polyamide molding composition with high melt stiffness for coextrusion with a high-melting-point polymer
 
Dowe et al of Evonik Degussa GmbH, Germany, formed multilayer composites from a molding composition of: a) 100 parts by weight of polyamide and b) from 0.005 to 10 parts by weight of a compound having at least two carbonate units by coextruding with a molding composition based on a high-melting-point polymer whose crystallite melting point Tm is at least 255 C. and/or whose glass transition temperature Tg is at least 180 C. (RDC 12/10/2012)

9. 8,288,461 
Thermoplastic elastomer composition
 
Hara and Morooka of the The Yokohama Rubber Co., Ltd., Japan, developed a thermoplastic elastomer including  a halogenated isoolefin/para-alkylstyrene copolymer rubber dispersed in a polyamide resin in order to improve the fatigue durability of a polyamide resin, while maintaining high flowability of the polyamide.  A thermoplastic elastomer composition comprising a continuous phase composed of a modified polyamide resin (A) and a dispersed phase composed of a halogenated isoolefin/para-alkylstyrene copolymer rubber (B) is provided. The modified polyamide resin (A) is a resin obtained by melt-kneading 100 parts by weight of a polyamide resin (C) with not less than 0.05 part by weight and less than 3 parts by weight a compound (D), such as a monofunctional epoxy compound, capable of binding to a terminal amino group of the polyamide resin at a temperature not lower than the melting point of the polyamide resin (C). The composition can be used as an inner liner of a pneumatic tire. (RDC 11/1/2012)

8. 8,257,613 
Filled compositions and a method of making
 
Bastiaens, Hagenaars and Matthijssen of  Sabic Innovative Plastics IP B.V., Netherlands,  developed a materials consisting of  a poly(arylene ether), a polyamide, electrically conductive filler, an impact modifier, and wollastonite wherein the wollastonite particles have an average length to diameter ratio less than or equal to 5 and a median particle size of 2 to 5 micrometers. This material shows improved impact strength and surface appearance and moldability compared to other similar materials   (RDC 9/10/2012)

7. 8,211,517 
Multi-layered coextruded tube
 
Martens, Mathew and  Topoulos of DuPont, Delaware, developed a multi-layered co-extruded tubes consisting of an outer layer of a first semiaromatic semicrystalline polyamide having a melt temperature of about 240 to 280 C,  a thermal stabilizer and an inner layer including a second semiaromatic semicrystalline polyamide having a glass transition equal to or greater than 100.degree. C. (RDC 7/9/2012)

6. 8,193,282 
Thermoplastic resin composition
 
Suzuki et al of DSM, Netherlands, developed a thermoplastic resin  which excels in impact resistance, dimension stability and rigidity, and also excels in appearance, fluidity and paint film adhesion property, and further which is very useful as manufacturing materials for exterior parts of automobile.  It consists of (A): a polyamide resin; (B): a hydrogenated product of block copolymer comprising vinyl aromatic polymer block (a) and conjugated diene based polymer block (b), and/or ethylene-.alpha.-olefin based block copolymer; (C): a modified hydrogenated product of block copolymer comprising the vinyl aromatic polymer block (a) and the conjugated diene based polymer block (b), which hydrogenated product is modified by addition of an unsaturated acid; (D): a plate-like and/or needle-like inorganic filler; and (F): an ethylene-vinyl alcohol copolymer and/or a partial saponified product of ethylene-vinyl acetate copolymer. (RDC 6/27/2012)

5. 8,187,683 
Multilayered polyamide tube for food packaging
 
Kuriu and Yabuta of Gunze Limited, Japan, developed a multilayered polyamide-based tube for food packaging that is free from blocking in a Layer (C), with an excellent adherence to processed meat or like packaged food.  This material consists of a Layer (A), a Layer (B) and a Layer (C); the multilayered polyamide-based tube having a low-temperature shrinkage ratio of 2 to 10%, and exhibiting heat shrinkage properties and gas barrier properties; the Layer (A) containing a polyamide-based resin; the Layer (B) containing a polyolefin-based resin; and the Layer (C) that comes in contact with the packaged food, the Layer (C) being a Layer (C-1) that contains a polypropylene-based resin having a heat distortion temperature (ISO 75B-1 or ISO 75B-2) of not less than 60.degree. C. and a Vicat softening point of not less than 120.degree. C., and that has a surface wetting tension of not less than 35 mN/m; or the Layer (C) being a Layer (C-2) that contains a linear low-density polyethylene having a density of not less than 0.92 g/cm.sup.3 but less than 0.95 g/cm.sup.3, and that has a surface wetting tension of not less than 35 mN/m. (RDC 6/6/2012)

4. 8,178,610 
Polyamide/poly(arylene ether) composition, method, and article
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Sokolowski of Sabic Innovative Plastics, Netherlands, developed a polyamide/poly(arylene ether) composition includes specific amounts of a block copolymer, glass fibers, and a compatibilized blend of at least two polyamides and a poly(arylene ether). The composition is particularly useful for molding automotive under-the-hood components that exhibit an improved balance of moldability, heat resistance, and resistance to brittle failure. (RDC 5/29/2012)

3. 8,178,607 
Polyamide compositions flame retarded with aluminium
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Costanzi and  Leonardi Italmatch Chemicals, Italy, developed a thermoplastic  containing aluminum hypophosphite (aluminum phosphinate), corresponding to the chemical formula Al(H2PO2)3 as halogen-free flame retardant agent, and a polyamide. The flame retarded halogen-free thermoplastic molding compositions according to the invention is used to produce articles based on polyamide polymers with or without glass fiber reinforcement, which are flame retarded. (RDC 5/29/2012)

2. 8,138,259 
Polyamide molding materials with an improved flowability, the production thereof and its use
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Schwitter et al of EMS-Chemie, Switzerland, developed a material for mobile telephone housings consisting of housing from a polyamide molding compound containing 70 to 99.5 wt% thermoplastic polyamide and 0.5 to 30 wt%  polyamide oligomer with linear or branched chain structure with a number average molar mass of 800 to 5000 g/mol with basic end groups which are at least partially NH2 end groups, and carboxyl end groups, one of these end groups being present in excess and the concentration of the end group present in excess being at most 300 mmol/kg.  For conductivity, the material is filled with carbon black or carbon fibers.  (RDC 5/16/2012)

1. 8,138,243 
Use of UV absorbers in the production of transparent polyamide molded parts
 
Buhler and Meyer Zu Westram of EMS, Switzerland, used an UV absorber in the transparent polyamide products or polyamide molded parts. This UV absorber must have a substituted benzoyl group.  The result is that such polyamide melts molding compounds leave no visible blooming on surfaces during processing of polyamide products.  UV absorbers in the form of a dibenzoylmethane compound and/or an aminohydroxybenzoyl benzoic acid ester are preferred.  (RDC 5/16/2012)

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Roger D. Corneliussen
Editor
www.maropolymeronline.com

Maro Polymer Links
Tel: 610 363 9920
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E-Mail: cornelrd@bee.net  

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Copyright 2012 by Roger D. Corneliussen.
No part of this transmission is to be duplicated in any manner or forwarded by electronic mail without the express written permission of Roger D. Corneliussen
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** Date of latest addition; date of first entry is 5/16/2012.